Malignant peripheral nerve sheath tumor of proximal third tibia

Area of Science:

• Oncology
• Pathology
• Orthopedic Oncology

Background:

• Malignant peripheral nerve sheath tumors (MPNSTs) are rare, aggressive neoplasms arising from peripheral nerves.
• MPNSTs can present as soft tissue masses, often in deep-seated locations.
• Previous nomenclature includes neurofibrosarcoma, malignant schwannoma, and neurogenic sarcoma.

Observation:

• A 16-year-old male presented with a year-long, progressively enlarging swelling over the anterior proximal tibia.
• Initial size was peanut-sized, increasing to 10 cm × 8 cm.
• Two prior fine needle aspiration cytology (FNAC) procedures suggested spindle cell sarcoma.

Findings:

• The tibial swelling was diagnosed as a Malignant Peripheral Nerve Sheath Tumor (MPNST).
• This case underscores the rarity of MPNSTs in this age group and location.
• FNAC was instrumental in achieving the correct pathological diagnosis.

Implications:

• Early and accurate diagnosis of MPNSTs is crucial for timely management.
• FNAC and core biopsy are valuable diagnostic tools for soft tissue sarcomas.
• Increased awareness of MPNST presentation can improve patient outcomes.